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Joachim Breitner authored
when in fact it does. This was pointed out by Johannes Bechberger and supported with seemingly statistically sound evidence in his Bachelor thesis: Of the benchmark shootout programs, 80% benefit significantly by switchtng from -O to -O2. See https://uqudy.serpens.uberspace.de/blog/2016/02/08/ghc-performance-over-time/ for a few raw numbers. Differential Revision: https://phabricator.haskell.org/D2065
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